Make sure everyone that you bring has their passport! If you have kids, either both parents need to be present, or if only one parent is taking kids through, there needs to be a written letter from the other parent saying it's okay to take them across the border. Each border has different procedures, so be sure to look them up before you cross through. Other than that, it's not to difficult to get through! The border in Washington state takes anywhere from 15 minutes to 2 hours depending on the traffic.